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BCM limp mode

Tiny
DW96
  • MEMBER
  • 2003 BUICK RENDEZVOUS
  • V6
  • AWD
  • AUTOMATIC
  • 150,000 MILES
Is it necessary to reset/reprogram the BCM when you replace the airbags

And after an overheat how do you get the computer to get out of limp mode.I've already replaced the water pump on it
Thursday, February 11th, 2016 AT 5:19 PM

13 Replies

Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Try disconnecting the battery for about 20 minutes and see if that does anything for you.
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Thursday, February 11th, 2016 AT 5:23 PM
Tiny
DW96
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  • 8 POSTS
JohnnyT73 do I need to reprogram the BCM after replacing the airbags
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Thursday, February 11th, 2016 AT 5:26 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
To my knowledge you do not.
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Thursday, February 11th, 2016 AT 5:28 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
You may need to erase the codes in the BCM. If it continues to set codes then there is still fault.
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Thursday, February 11th, 2016 AT 5:29 PM
Tiny
DW96
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  • 8 POSTS
Thank you for helping a fellow technician (student technician) out
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Thursday, February 11th, 2016 AT 5:29 PM
Tiny
DW96
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  • 8 POSTS
That would mean a wiring issue most likely a short correct?
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Thursday, February 11th, 2016 AT 5:33 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Thats usually how airbag circuits work. They function by causing shorts in the system. If you can pull the codes it should guide you in the right direction. If the airbags deployed and you replaced the airbags then if the car has pretensioners in the seatbelt(s). They pay have discharged as well and need replacing. Check codes first though.
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Thursday, February 11th, 2016 AT 5:36 PM
Tiny
DW96
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Stupid question.I haven't been a tech for long. How would you check the pretensioner to see if it had deployed
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Thursday, February 11th, 2016 AT 5:41 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
It's kinda hard to describe so that it makes sense. You will have to visually see it in the car. The part that the seat belt connects to is usually about a 5-6 inch cable coming out of the pretensioner body. If it looks like it's pulled into the body then it has discharged. The codes will tell you if the pretensioner is short circuited.
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Thursday, February 11th, 2016 AT 5:57 PM
Tiny
LUCKYONE
  • MEMBER
  • 1 POST
I got a 2004 Buick rendezvous it stopped on me wouldn't jump off when I got it home changed starter didn't help but left it unhooked from battery now found inside car 30 amp metal fuse bad do I need to reset bcm cause I now don't have low beam head lights window want work doors locks don't work so what cause that
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Sunday, February 25th, 2018 AT 6:33 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It sounds like the BCM has had a problem could be from a voltage spike when the battery was connected.

You will need the BCM reprogrammed by a shop here is the location.

Please let us know what happens.

Cheers, Ken
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Wednesday, February 28th, 2018 AT 11:23 AM
Tiny
LUCKYONE
  • MEMBER
  • 1 POST
Thanks I got it fixed it was the wires got cought in the seat rail and cut them caused a direct short.
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Thursday, March 1st, 2018 AT 7:58 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help. Send a pic of the damage if you can :)

Cheers, Ken
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Thursday, March 1st, 2018 AT 10:49 AM

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